Arctic gant eggs, (victual); eggs of the gorean migratory arctic gant. The eggs, when frozen, they are eaten like apples.

Numenius borealis

I stepped aside to let a young girl pass, who carried two baskets of eggs, those of the migratory arctic gant. They nest in the mountaim of the Hrimgar and in steep, rocky outcroppings, called bird cliffs, found here and there jutting out of the tundra. The bird cliffs doubtless bear some geological relation to the Hrimgar chains. When such eggs are frozen they are eaten like apples. 
Book 12, Beasts: Page 19